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  • Erratum to: Long-Period Oscillations of Solar Facular Knots
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    A. A. Solov’ev, V. V. Smirnova, P. V. Strekalova

    An Erratum to this paper has been published: https://doi.org/10.1134/S1990341320040057

    更新日期:2021-01-14
  • Observations of Radial Velocity Variability in Stars from the Spectra Obtained with the BTA Fiber-Fed Spectrograph in High Spectral Resolution Mode
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    T. E. Burlakova, G. G. Valyavin, V. N. Aitov, G. A. Galazutdinov, A. F. Valeev, I. A. Yakunin, D. R. Gadelshin, V. D. Bychkov, A. V. Tavrov, A. E. Ivanova, O. I. Korablev

    Abstract—We present the results of observations of radial velocity variability in stars with exoplanets. Observations of a number of stars with characteristic stellar magnitudes from 8.54m to 10.5m were carried out using a new high-resolution (R = 35 000–120 000) fiber-fed spectrograph mounted at the foundation of the 6-m BTA telescope, in the mode of resolutions from R = 45 000 to R = 65 000 with

    更新日期:2021-01-14
  • Mass Constraint of Several Transiting Planets
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    D. R. Gadelshin, G. G. Valyavin, Byeong-Cheol Lee, Gwanghui Jeong, Han Inwoo, G. A. Galazutdinov, V. N. Aitov, I. A. Yakunin, T. E. Burlakova, A. F. Valeev

    Abstract—We present the measurements of masses of two exoplanets and one exoplanet candidate: the candidate we earlier confirmed in the KOI-974 system, a new TESS candidate in the TOI-1797 system, and the well-known hot Jupiter MASCARA-3b. The observations were carried out using the first prototype of the high-resolution fiber-opticspectrograph of the 6-m BTA telescope, and with the BOES spectrograph

    更新日期:2021-01-14
  • Globular Clusters Lost by the Sagittarius Dwarf Spheroidal Galaxy
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    N. R. Arakelyan, S. V. Pilipenko, M. E. Sharina

    Abstract—In this work a search was carried out for globular clusters belonging to the Sagittarius (Sgr) tidal stream using the analysis of spatial positions, radial velocities relative to the Galactic Standard of Rest (VGSR), proper motions and ratio of “age–metallicity” ([Fe/H]) for globular clusters and for stars in the tidal stream. As a result, three categories of globular clusters were obtained:

    更新日期:2021-01-14
  • Improving the Efficiency of High-Resolution Spectroscopy on the 6-m Telescope Using Adaptive Optics Techniques
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    V. G. Klochkova, Yu. V. Sheldakova, V. V. Vlasyuk, A. V. Kudryashov

    Abstract—We briefly discuss the stages of the development of high-resolution spectroscopy methods used with the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences, which are related to the problem considered. We consider the possibility of the multiple increase of the stellar spectroscopy efficiency as a result of application of state-of-the-art solutions in the

    更新日期:2021-01-14
  • Probable Inner Magnetic Structures of Magnetic Stars. II
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    Yu. V. Glagolevskij, A. F. Nazarenko

    Abstract—The features of the simplest inner structures of a magnetic field, the central dipole and the shifted dipole, are considered. Their secular stability, solidity of rotation, and a great variety of orientations of magnetic dipoles and magnitudes of magnetic fields are noted.

    更新日期:2021-01-14
  • Zeiss-1000 SAO RAS: Instruments and Methods of Observation
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    V. V. Komarov, A. S. Moskvitin, V. D. Bychkov, A. N. Burenkov, S. V. Drabek, V. S. Shergin, E. V. Emelyanov, V. N. Komarova, V. P. Romanenko, V. N. Aitov

    Abstract—The paper describes Zeiss-1000, the one meter telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS), the history of the development of its observation methods and potential areas of astrophysical research. Detailed attention is paid to instruments and methods of observation which are in service nowadays.

    更新日期:2021-01-14
  • Specifics of the Distribution of Orbits of Long-Period Comets in the Inner Part of the Oort Cloud
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    O. V. Kalinicheva, Yu. A. Chernetenko

    Abstract—We investigate statistical patterns in the distribution of the orbits of long-period comets that belong to the inner region of the Oort cloud (with aphelion distances, Q, lying in the 50–2000 AU interval). We show that the distribution of aphelia is not random and such patterns can be due, in particular, to the presence of hypothetical massive bodies in the region considered. We varied the

    更新日期:2021-01-14
  • On the Motion of Stars in the Pleiades According to Gaia DR2 Data
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    V. M. Danilov, A. F. Seleznev

    Abstract—Several parameters of the Pleiades cluster were estimated. We used Gaia DR2 data on the coordinates, proper motions, and radial velocities of stars in regions with radius d° =2.5° and size 60° × 60° around the cluster center. Based on data on stars with magnitudes mG ≤ 18m, we constructed a map and profile of the density, luminosity and mass functions of the cluster, determined the cluster

    更新日期:2021-01-14
  • Quenched Galaxies in Clusters of Galaxies and Their Outskirts
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    F. G. Kopylova, A. I. Kopylov

    Abstract—Based on the SDSS catalog data the properties of galaxies with quenched star formation (QGs) within the “splashback”-radius of galaxy clusters Rsp and beyond it have been studied. We used a sample of 40 groups and galaxy clusters and a sample of field galaxies at 0.02 < z < 0.045. The radii Rsp were defined from the observed integral distribution of the number of galaxies as a function of

    更新日期:2021-01-14
  • Relative Motion in the Hierarchical Triple System ADS48 on the Basis of Gaia DR2 and 26-Inch Refractor of Pulkovo Observatory Data
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    O. V. Kiyaeva, R. Ya. Zhuchkov, I. S. Izmailov

    Abstract—According to the exact positions and proper motions of the three components of the star ADS48 from Gaia DR2, their parallax and radial velocities for the epoch 2015.5 the instantaneous relative positions and motions of the components were determined. Only from the Gaia DR2 observations, the family of orbits of the AB pair was calculated by the method of apparent motion parameters, from which

    更新日期:2021-01-14
  • Ionized Gas in the NGC 3077 Galaxy
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    D. V. Oparin, O. V. Egorov, A. V. Moiseev

    Abstract—The nearby dwarf galaxy NGC 3077 is known for its peculiar morphology, which includes numerous dust lanes and emission-line regions. The interstellar medium in this galaxy is subject to several perturbing factors. These are primarily the central starburst and tidal structures in the M81 group. We present a comprehensive study of the state of ionization, kinematics, and chemical composition

    更新日期:2021-01-14
  • Distance to the Dorado Group
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    N. A. Tikhonov, O. A. Galazutdinova

    Abstract—Based on the archival images from the Hubble Space Telescope, we performed the photometry of the brightest galaxies of the Dorado group: NGC 1433, NGC 1533, NGC 1566, and NGC 1672. In the obtained CM-diagrams, red giants are specified, and distances to galaxies are measured by the TRGB method. The estimates obtained: 14.2 ± 1.2, 15.1 ± 0.9, 14.9 ± 1.0, and 15.9 ± 0.9 Mpc show that all the

    更新日期:2021-01-14
  • Magnetic Fields of Chemically Peculiar and Related Stars. VI. Main Results of 2019 and Near-Future Prospects
    Astrophys. Bull. (IF 1.191) Pub Date : 2021-01-14
    I. I. Romanyuk

    Abstract—The paper provides a review of important results of studies of chemically peculiar and related magnetic stars. More than 90 papers published in the world leading astronomical journals mainly in 2019 were analyzed. The most important results: high-accuracy photometric light curves were obtained during the TESS satellite; we discovered several dozen of new chemically peculiar magnetic stars;

    更新日期:2021-01-14
  • Large Scale Distribution of Galaxies in the Field HS 47.5–22. II. Observational Data Analysis
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    A. A. Grokhovskaya, S. N. Dodonov, T. A. Movsesyan

    Abstract We present results of the study of the large scale distribution of galaxies up to z ~ 0.8 in the field HS 47.5–22 based on the photometric data obtained with the 1 m Schmidt telescope of the Byurakan astrophysical observatory (BAO NAS). The complete sample includes 28 398 galaxies brighter than \({{m}_{{{\text{AB}}}}} = {{23}^{{\text{m}}}}~\)up to \(z \sim 0.8\). Clusterings of density in

    更新日期:2020-09-22
  • Estimation of the Gould Belt Scale Height from T Tauri Type Stars in the Gaia DR2 Catalog
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    V. V. Bobylev, A. T. Bajkova

    Abstract—We analyze the spatial and kinematic properties of a large sample of young T Tauri type stars in a 500 pc radius solar neighborhood, closely related to the Gould belt. The following parameters of the exponential density distribution have been determined: the average \({{({{z}_{{\text{G}}}})}_{ \odot }} = - 25 \pm 5\) pc and scale height \({{h}_{{\text{G}}}} = 56 \pm 6\) pc. We propose a method

    更新日期:2020-09-22
  • Results of Magnetic-Field Measurements with the 6-m Telescope. VI. Observations in 2012
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    I. I. Romanyuk, A. V. Moiseeva, E. A. Semenko, D. O. Kudryavtsev, I. A. Yakunin

    Abstract—The paper presents complete results of measurements of the magnetic-field longitudinal component Be and radial velocities VR for 163 objects, mainly main-sequence chemically peculiar stars and standards. Observations were carried out in 2012 at the 6-m BTA telescope using the Main Stellar Spectrograph (MSS) equipped with a Zeeman analyzer. Six new chemically peculiar magnetic stars were discovered:

    更新日期:2020-09-22
  • Super-Fast Line-Profile Variability in the Spectra of OBA Stars. II. A0 Star α 2 CVn
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    A. F. Kholtygin, A. A. Batrakov, S. N. Fabrika, A. F. Valeev, A. E. Kostenkov, O. A. Tsiopa

    Abstract—This study continues the investigation of the super-fast variability of line profiles in the spectra of stars of early spectral classes performed in 2017 and 2018. We investigated the variability of line profiles in the spectra of OBA stars with the SCORPIO multi-mode focal reducer at the 6-m SAO RAS telescope (BTA). Short-period regular variations of the H and He lines were detected in the

    更新日期:2020-09-22
  • On the Possibility of Using Mid-Band Filters to Search for Polar Candidates
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    M. M. Gabdeev, T. A. Fatkhullin, N. V. Borisov

    Abstract—This paper presents a method for searching for polar candidates using mid-band filters. One of the spectral features of polars is the HeII λ4686 strong emission line. We selected the Edmund Optics color filters with central wavelengths of 470, 540, and 656 nm and a transmission bandwidth of 10 nm. These filters cover the regions of the HeII λ4686 line, continuum, and the Hα line respectively

    更新日期:2020-09-22
  • Analysis of Integrated-Light Spectra of Galactic Globular Clusters
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    M. E. Sharina, V. V. Shimansky, N. N. Shimanskaya

    Abstract We present the results of determination of the age, helium mass fraction (Y), metallicity ([Fe/H]), and abundances of the elements C, O, Na, Mg, Ca, Ti, Cr and Mn for 26 globular clusters of the Galaxy. In this work, we apply a method developed by us that employs medium-resolution integrated-light spectra of globular clusters and models of stellar atmospheres and it is supplemented in this

    更新日期:2020-09-22
  • Study of Star-Forming Regions in the Peculiar Galaxies NGC 660, NGC 1512, NGC 4395, and NGC 4618
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    K. I. Smirnova, D. S. Wiebe, A. V. Moiseev, G. I. G. Jozsa

    Abstract—The star-forming regions (SFRs) in the peculiar galaxies NGC 660, NGC 1512, NGC 4395 and NGC 4618 are studied. The relationships between such characteristics of star forming regions as UV, near- and far-IR fluxes, as well as in the Hα and HI lines, surface brightness in these ranges, and the scatter of the radial velocities of ionized and neutral hydrogen are considered. It is shown that in

    更新日期:2020-09-22
  • Superfast Line Profile Variations in the Spectra of OBA Stars. III. A0 Star α 2 Cvn, New Results
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    A. F. Kholtygin, A. V. Moiseeva, I. A. Yakunin, S. Hubrig

    Abstract—This work is a continuation of the studies of the ultrafast variability of line profiles in the spectra of early-type stars. Line profile variations in the spectrum a chemically peculiar A0Vp star α2 CVn are investigated using the January 6, 2020 observations carried out with the 6-meter BTA telescope at SAO RAS equipped with the MSS spectrograph. Regular short-term periodic variations of

    更新日期:2020-09-22
  • Progenitor and Remnant of the Luminous Red Nova V838 Monocerotis
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    V. P. Goranskij, E. A. Barsukova, A. N. Burenkov, A. F. Valeev, A. V. Zharova, P. Kroll, N. V. Metlova, S. Yu. Shugarov

    Abstract—The article presents the results of multicolor photometry, medium and low resolution spectroscopy of the red nova V838 Mon remnant for 16 years after the 2002 outburst. We also used the archival photometry with the photographic plates of the Sonneberg and Moscow collections from 1928 to 1994. Analysis of these observational data confirmed that the progenitor of the V838 Mon explosion was a

    更新日期:2020-09-22
  • Theseus–BTA Cosmological Crucial Tests Using Multimessenger Gamma-Ray Bursts Observations
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    S. I. Shirokov, I. V. Sokolov, V. V. Vlasyuk, L. Amati, V. V. Sokolov, Yu. V. Baryshev

    Abstract—Modern Multimessenger Astronomy is a powerful instrument for performing crucial tests of the Standard Cosmological Model in the wide redshift interval up to z ∼ 10. This testing is principally important for discussion related to discrepancies between local and global measurements of cosmological parameters. We present a review of multimessenger gamma-ray burst observations currently performed

    更新日期:2020-09-22
  • Determination of the Coordinates of Radio Sources on the Sun from RATAN-600 Observations in Multiazimuth Mode
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    L. V. Opeikina, V. E. Abramov-Maximov, V. N. Borovik, V. N. Chernenkov

    Abstract We provide an analytical description of the method for the determination of the coordinates of solar radio sources from multi-azimuth observations on RATAN-600. We analyze models of the displacement of the object across the scan depending as a function of azimuth taking into account solar rotation and suggest a method for estimating the rate of displacement due to rotation. We demonstrate

    更新日期:2020-09-22
  • Peculiarities of Abundances of Selected Elements in Metal-Rich Field RR Lyrae Stars
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-09-22
    M. L. Gozha, V. A. Marsakov, V. V. Koval’

    Abstract We use the data of our extended catalog of spectroscopic determinations of elemental abundances in the atmospheres of Galactic-field RR Lyrae type variables to show that metal-rich RR Lyraes ([Fe/H] > −1.0) have anomalous abundances of some elements. In particular, the relative abundances of scandium, titanium, and yttrium in metal-rich RR Lyrae type variables are lower than the corresponding

    更新日期:2020-09-22
  • Cas5 Association at the GaiaDR2 Era
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    E. L. Chentsov

    Abstract—Using the data from the second release of the Gaia exoatmospheric astrometric observatory archive the structure of the Cas5 OB association and the parameters of stars of extremely high luminosity that it contains have been refined. Two groups of OB stars have been isolated in the direction of the association at distances 3.3 and 4.3 kpc.

    更新日期:2020-07-27
  • Nonstationarity of the Atmosphere of κ Cas. III. Atmosphere Kinematics
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    A. Kh. Rzaev

    Abstract—The variability of radial velocities, equivalent widths and central line depths in the spectrum of the κ Cas supergiant was studied using CCD coude-echelle spectra with high spectral resolution and signal-to-noise ratio. The radial velocity variability of all the studied lines is due to non-radial pulsations. The variability parameters (period P, amplitude A and average value γ) of radial

    更新日期:2020-07-27
  • Search for Candidate Objects with the Sunyaev–Zeldovich Effect on Planck Maps in the Neighborhood of RCR Catalog Radio Sources
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    E. K. Majorova; O. V. Verkhodanov; O. P. Zhelenkova

    AbstractMillimeter- and submillimeter-wave maps are used to select potential candidate objects with the Sunyaev–Zeldovich effect in the vicinity of RCR (RATAN Cold Refined) radio sources. The properties of “hot” and “cold” spots in the right-ascension interval 2h ≤ RA ≤ 17h and the declination strip \({\text{De}}{{{\text{c}}}_{{2000}}} = 45^\circ .9' \pm 15'\) are studied. In the entire strip a total

    更新日期:2020-07-27
  • Long-Period Oscillations of Solar Facular Knots
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    A. A. Solov’ev; V. V. Smirnova; P. V. Strekalova

    Abstract—Observations of facular areas of the Sun using the Helioseismic and Magnetic Imager device of the Solar Dynamics Observatory allow detecting long-period oscillations in the magnetic field of facular knots with periods ranging from 30 to 250 minutes. Statistically significant oscillation modes are selected by the method of time series decomposition in empirical modes. During the observation

    更新日期:2020-07-27
  • Contribution of a Non-Thermal Component to the X-Ray Emission of OB Stars
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    E. B. Ryspaeva; A. F. Kholtygin

    Abstract—In the paper the possibility of the presence of a non-thermal component described by a power law spectrum in the X-ray spectra of OB stars is investigated. The low-resolution spectra of 101 OB stars obtained using the EPIC camera on the XMM satellite are analyzed. It is concluded that the contribution of the non-thermal component of X-ray emission can be significant and even determining for

    更新日期:2020-07-27
  • Evolutionary Features and Other Characteristics of Magnetic Stars with Helium Anomalies (He-r, He-w)
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    Yu. V. Glagolevskij

    Abstract—We critically review the results of earlier studies on magnetic stars with anomalous helium lines. We discuss the issues associated with the fossil-field theory and the scenario of the formation of magnetic stars. A special feature of the results of our study is that they are derived from more than 160 direct estimates of average surface magnetic fields Bs or models obtained by the method

    更新日期:2020-07-27
  • Large-Scale Structure of Gas-and-Dust Disks and Stability of Gas-Dynamic Equilibrium of the Dust Envelopes of Young Stars
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    T. R. Abdulmyanov

    Abstract—The paper analyzes the origin for the separation of gas-and-dust disks around young stars into two large groups: those with circular and spiral structures. Such a separation of disk structures is explained by the existence of stable and unstable gas-dynamic equilibrium of protostellar envelopes. A model of wave disturbances of the gas-dust protostellar envelopes is constructed. The equation

    更新日期:2020-07-27
  • Microbial Component Detection in Enceladus Snowing Phenomenon
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    J. Kotlarz; U. Zielenkiewicz; N. E. Zalewska; K. A. Kubiak

    AbstractEnceladus is an attractive place to look for signs of life thanks to liquid water and the availability of energy. Recent research has proven that the ejected material of Enceladus south pole consists of water vapor, water ice, carbon dioxide, methane and molecular hydrogen. Possible similarities of physical and chemical conditions between Enceladus ocean bottom and the carbonate mineral matrix

    更新日期:2020-07-27
  • “Semi-Dark” Dwarf Galaxy Coma P on the Periphery of the Virgo Galaxy Cluster
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    N. A. Tikhonov; O. A. Galazutdinova; G. M. Karataeva

    Abstract—Based on archived images from the Hubble Space Telescope, stellar photometry of the dwarf galaxy Coma P, located near the Virgo galaxy cluster, was performed. The selection of weakly luminous regions of the galaxy showed that Coma P consists of two interacting dwarf galaxies, one of which has a weak star formation, and the second galaxy has a very low surface brightness, there is no star formation

    更新日期:2020-07-27
  • Conceptual Design of a High Temporal Resolution System for the Detection of the Fluxes of Stochastic Events
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    V. L. Plokhotnichenko

    Abstract—This paper presents the functional design of “Quantochron 5-48” high temporal resolution system for multidimensional chronometration of stochastic fluxes. The device can determine the photon arrival times by array detectors and the accompanying spatial, spectral, and polarization characteristics of these photons, with a sampling time of 10 nanoseconds and the accuracy of UTC calibration provided

    更新日期:2020-07-27
  • Modeling of Extended Atmospheres with Temperatures below 40000 K
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    A. Kostenkov; A. Vinokurov; Y. Solovyeva; K. Atapin; S. Fabrika

    AbstractWe calculate models of extended stellar atmospheres with a temperature in the range of 12 000–40 000 K and a mass loss rate of \({{10}^{{ - 6}}}\)–\({{10}^{{ - 4}}}{{M}_{ \odot }}\)\({{{\text{yr}}}^{{ - 1}}}\). A large number of objects with emission spectra, such as luminous blue variables, FeII—emission line stars, Of/late-WN stars, and even ultraluminous X-ray sources often have effective

    更新日期:2020-07-27
  • High-Resolution Fiber-Fed Spectrograph for the 6-m Telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences: Assessment of Efficiency
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    G. G. Valyavin; F. A. Musaev; A. V. Perkov; V. N. Aitov; V. D. Bychkov; S. V. Drabek; V. S. Shergin; D. A. Sazonenko; D. E. Kukushkin; G. A. Galazutdinov; E. V. Emelyanov; G. V. Yakopov; T. E. Burlakova; J.-L. Bertaux; A. V. Tavrov; O. I. Korablev; M. V. Yushkin; A. F. Valeev; D. R. Gadelshin; K.-M. Kim; Inwoo Han; B.-Ch. Lee

    Abstract—We report the results of laboratory tests of the first version of the high-resolution fiber-fed spectrograph designed for the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS). During laboratory tests a spectral resolution of about 70 000 was achieved. The peak efficiency of the entire optical path of the spectrograph (without light losses at the CCD, primary mirror

    更新日期:2020-07-27
  • Distance Measurements to Parent Galaxies of SNIa by the Tip of the Red-Giant Branch
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    A. V. Antipova; D. I. Makarov; L. N. Makarova

    Abstract—We use the archival data obtained with the Hubble space telescope to measure distances by the tip of the red-giant branch (TRGB) method to SNIa parent galaxies. Our sample consists of four galaxies: NGC2841, NGC4496A, NGC4535, and NGC4527. For three of them, we were able to determine only the lower bounds of the distance. For the galaxy NGC4527, we estimated the TRGB distance modulus: (m − M)0

    更新日期:2020-07-27
  • Correlation of Gravitational Waves–Neutrino Detectors: The Long Neutrino Voyage from SN1987A
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-07-27
    F. Buccella; G. V. Pallottino; P. Galeotti; G. Pizzella

    AbstractThe correlation between the data obtained with two gravitational wave (GW) detectors (in Rome and in Maryland) and two neutrino detectors (LSD in Italy and Kamiokande in Japan) has been studied in more detail. If we indicate with U1 the response of the gravitational wave detectors and with U2 the response of the neutrino detectors, we find that there is a clear time correlation between U1 and

    更新日期:2020-07-27
  • Ha Images of Ultra-Flat Edge-On Spiral Galaxies
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-04-15
    S. S. Kaisin; I. D. Karachentsev; H. Hernandez-Toledo; L. Gutierrez; V. E. Karachentseva

    Abstract—We present the Hα images of ultra-flat (UF) spiral galaxies seen practically edgeon. The galaxies have the angular diameter in the B band \(a > 1.9' \) and the apparent axial ratio (a/b) > 10. We found that their Hα images look, on average, almost two times thinner than those in the red continuum. The star-formation rate in the studied objects, determined from the Hα flux, is in good agreement

    更新日期:2020-04-15
  • Photosensor Device Based on a 16-Electrode Position-Sensitive Detector with High Temporal Resolution
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-04-15
    V. L. Plokhotnichenko; G. M. Beskin; S. V. Karpov; A. V. Solin; A. A. Solin; A. S. Terekhov; S. N. Kosolobov; G. E. Scheibler; V. G. de Bur; S. V. Moiseev; V. V. Pavlova; S. S. Moiseev

    Abstract—We report the development of a photosensor device based on a position-sensitive detector with a gallium arsenide (GaAs) cathode and a 16-element anode. In the case of asymmetric heterostatic circuit (electrodes combined in fours) its working field was limited by 10 mm (for a 18-mm photocathode). Implementing a scheme of analog coding of the coordinates of the centroids of electron avalanches

    更新日期:2020-04-15
  • Inconsistency of Chemical Properties of Stellar Populations in the Thick Disk Subsystem of our Galaxy
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-04-15
    V. A. Marsakov; V. V. Koval’; M. L. Gozha

    Abstract—Using modern published data on velocities and spectroscopic definitions of chemical elements in stellar objects of the Galaxy, we investigated the relationship of chemical composition with the kinematics of different populations. The paper shows that the old stellar populations of the Galaxy, belonging (by the kinematic criterion) to the thick disk subsystem—globular clusters, field variables

    更新日期:2020-04-15
  • Internal Kinematics of the Seyfert Galaxy Mkn938
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-04-15
    V. L. Afanasiev; A. V. Moiseev; A. A. Smirnova

    Abstract—We report the results of a detailed study of the central part of the Seyfert galaxy Mkn938. Observational data were obtained with the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences using integral field spectrograph MPFS and a scanning Fabry–Perot interferometer. Mkn938 is interesting for being a result of a merger of two gas-rich galaxies, and we

    更新日期:2020-04-15
  • IPv6 for the Evolution of the Network of the Special Astrophysical Observatory of the Russian Academy of Sciences
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-04-15
    V. N. Chernenkov

    Abstract—Requirements to a modern computer network of a research organization, in particular, to the local-area network of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) are described. The choice of the direction of the development of primary tools for supporting the observing process and based on local network infrastructure services of SAO RAS is defined. This

    更新日期:2020-04-15
  • Effective Gyroresonance Layers in the Transition Region of the Active Region of the Solar Atmosphere. Magnetic Fields and Heights
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-04-15
    L. V. Yasnov; V. M. Bogod; A G. Stupishin

    Abstract—We present a method of determination of numbers of gyroresonance layers most effectively radiating in the transition region of the active solar atmosphere. It is based on determination of frequency in the spectrum of an extraordinary wave of an active region, at which the gradient of this spectrum abruptly rises. Observations of 29 active regions carried out at the RATAN-600 radio telescope

    更新日期:2020-04-15
  • Small Bodies of the Solar System Active at Large Heliocentric Distances: Studies with the 6-Meter Telescope of Sao Ras
    Astrophys. Bull. (IF 1.191) Pub Date : 2020-04-15
    A. V. Ivanova

    Abstract—A detailed study of comets active at large heliocentric distances (greater than 4 au) which enter the Solar System for the first time and are composed of matter in its elementary, unprocessed state, would help in our understanding of the history and evolution of the Solar System. In particular, contemporary giant planet formation models require the presence of accretion of volatile elements

    更新日期:2020-04-15
  • Photometric Reverberation Mapping of AGNs at 0.1 < z <0.8. I. Observational Technique
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    R. I. Uklein; E. A. Malygin; E. S. Shablovinskaya; A. E. Perepelitsyn; A. A. Grokhovskaya

    The improvement of the calibration relation for determining the size of the broad-line region from the observed optical luminosity of active galactic nuclei (AGN) is a necessary task to study fundamental parameters of distant AGNs such as mass of the central supermassive black hole. The most popular method of the BLRsize estimation is the reverberation mapping based onmeasuring the time delay between

    更新日期:2019-12-10
  • Spectral Properties of Background Signal Peaks at Medium and High Multipoles
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    V. V. Pushkarev; E. K. Majorova; O. V. Verkhodanov

    The spectral properties of inhomogeneities of the cosmic microwave background are considered. The inhomogeneity spectra are studied in the frequency range from 30 to 217 GHz according to multi-frequency maps of the Planck space mission with smoothing at different angular sizes. According to the thermodynamic temperature versus frequency relation, it is shown that the map at 70 GHz has a signal distribution

    更新日期:2019-12-10
  • Distance to Irregular Galaxy Cas 1 Located near the Milky Way
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    N. A. Tikhonov

    We conducted the stellar photometry using the archive images of the Hubble Space Telescope of the dwarf irregular galaxy Cas 1 located near the Milky Way. Blue supergiants detected in the obtained Hertzsprung-Russell diagram are concentrated in star-forming regions. We found that the red star branch consists of numerous AGB stars and a small number of brighter red supergiants. In the luminosity function

    更新日期:2019-12-10
  • Multifrequency Study of GHz-peaked Spectrum Sources
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    Yu. V. Sotnikova; T. V. Mufakharov; E. K. Majorova; M. G. Mingaliev; R. Yu. Udovitskii; N. N. Bursov; T. A. Semenova

    Gigahertz-Peaked spectrum (GPS) sources are compact active galactic nuclei, presumably young precursors of bright radio sources. The study of GPS radio properties provides information about the features of synchrotron radiation in extragalactic sources. Also in applied research, GPS sources are useful as compact stationary radio sources in the sky for astrometric purposes. This paper presents the results

    更新日期:2019-12-10
  • Globular Clusters of the Galaxy: Chemical Composition vs Kinematics
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    V. A. Marsakov; V. V. Koval’; M. L. Gozha

    A comprehensive statistical analysis of the relationship between the chemical and spatially kinematic parameters of the globular clusters of the Galaxy has been performed. The data of the author’s compilation catalog contain astrophysical parameters for 157 clusters and the relative abundances of α-elements for 69 clusters. For 121 clusters, the data are supplemented by spatially kinematic parameters

    更新日期:2019-12-10
  • Galaxy Clusters and Their Outskirts: the “Red Sequence”, Star Formation Rate, Stellar Mass
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    F. G. Kopylova; A. I. Kopylov

    We study the nearest outskirts (R < 3R200c) of 40 groups and clusters of galaxies of the local Universe (0.02 < z < 0.045 and 300 km s-1 < σ < 950 km s-1). Using the SDSS DR10 catalog data, we determined the stellar mass of galaxy clusters corresponding to Ks-luminosity (which we determined earlier based on the 2MASX catalog data) (M*/M⊙) ∝ (LK/L⊙)1.010±0.004 (MK < - 21m.5, R < R200c). We also found

    更新日期:2019-12-10
  • Photometric Studies of 21 Eclipsing Binaries with Eccentric Orbits
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    V. S. Kozyreva; A. V. Kusakin; T. Krajci; A. I. Bogomazov

    The paper describes a target setting of searching for apsidal motion in 21 eclipsing binaries. We estimate the capability of its determination for the systems of interest in the coming years, as well as present results of observations in 2009–2018, in which the minima of the light curves of these stars have been obtained. The accuracy of orbital period determination of the studied binaries is 10–100

    更新日期:2019-12-10
  • Large Scale Distribution of Galaxies in The Field HS 47.5-22. I. Data Analysis Technique
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    A. A. Grokhovskaya; S. N. Dodonov

    We present the results of methodological works on automated analysis of the large scale distribution of galaxies. Selecting candidates for clusters and groups of galaxies was carried out using two complementary methods of determining the density contrast maps in the narrow layers of the three-dimensional large scale distribution of galaxies: the filtering algorithm with an adaptive core and the Voronoi

    更新日期:2019-12-10
  • Long-Term Activity of a Little Known Dwarf Nova DT Octantis
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    V. Šimon; H. Edelmann

    We analyze the long-term activity of a little known dwarf nova (DN) DT Oct. We use photographic observations from the Bamberg Observatory (Southern Patrol Photographic Sky Survey), CCD data from ASAS-3 survey, and AAVSO data (both CCD and visual). We determined the recurrence times of the superoutbursts, TCso, and of the normal outbursts, TCno, to be approximately 311 d and about 30 d, respectively

    更新日期:2019-12-10
  • Analysis of the Spectroscopic Observations of RS CVn Type Star V837 Tau
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    A. I. Kolbin; V. V. Shimansky; I. Yu. Alekseev; N. N. Shimanskaya; M. M. Gabdeev; V. V. Tsymbal

    We present an analysis of the spectra of the star V837 Tau, which belongs to a class of chromosphere-active RSCVn type stars. The observational material was obtained with the 1.5-m Russian-Turkish telescope RTT-150 and the 2.6-m Shajn telescope of the Crimean astrophysical observatory. To reveal signs of the photosphere spottedness of the primary and to isolate the faint secondary, we performed the

    更新日期:2019-12-10
  • Variations in the Brightness Variability Amplitude of A–M Stars
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    I. S. Savanov

    We study relations of the parameter Rvar (amplitude of the brightness variability, stellar activity indicator) with respect to the effective temperature and the period of rotation of stars belonging to the A–M spectral types. A common dataset gives an idea of variations in this parameter for stars with convection. It was confirmed that the limit of applicability for the gyrochronological relation PtM

    更新日期:2019-12-10
  • Physical and Dynamical Parameters of the Triple Stellar System: HIP 109951
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    S. G. Masda; J. A. Docobo; A. M. Hussein; M. K. Mardini; H. A. Al-Ameryeen; P. P. Campo; A. R. Khan; J. M. Pathan

    The precise determination of the physical and dynamical parameters of the HIP 109951 triple star system (WDS J22161-0705AB) which is formed by the A, Ba, and Bb components are presented. The binary nature of component B was recently confirmed by studying the radial velocities. The analysis of the system follows Al-Wardat's complex method for analyzing CVBS which employs Kurucz (Atlas9) line blanketed

    更新日期:2019-12-10
  • Unity and Diversity of Yellow Hypergiants Family
    Astrophys. Bull. (IF 1.191) Pub Date : 2019-12-10
    V. G. Klochkova

    We present the results of long-term spectral monitoring of yellow hypergiants (YHGs) of northern hemisphere with a R ≥ 60 000 resolution. The spectra of these F–G stars of extreme luminosity, compactly located at the top of the Hertzsprung–Russell diagram revealed a variety of spectral features: various types of Hα profile, the presence (or absence) of forbidden and permitted emissions, as well as

    更新日期:2019-12-10
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